Dr J. Olof Johansson
Our aim is to understand how light can be used to probe, and eventually control, electrons in magnetic molecular materials. We use ultrafast magneto-optical (MO) pump-probe techniques, which are one of very few methods that can directly probe the spin state of electrons on timescales relevant for photoexcitation (fs to ps).
The MO signal is obtained by carefully measuring the change in polarisation state of the probe pulse. To understand the photophysics of the materials, we also use transient absorption spectroscopy. A continued development of new magnetic materials and new ways of controlling them will contribute to the development of future information storage devices.
- Observation of excited state absorption in the V-Cr Prussian blue analogue, L. Hedley, M.D. Horbury, F. Liedy, J.O. Johansson, Chemical Physics Letters, 687, 125 (2017).
- Metal-to-metal charge-transfer transitions in Prussian blue hexacyanochromate analogues, D.M. Rogers and J.O. Johansson, Mater. Sci. Eng. B, 227, 28 (2017).
- Electrochromic Thin Films of the V-Cr Prussian Blue Analogue Molecular Magnet, L. Hedley, N. Robertson, and J. O. Johansson, Electrochim. Acta 236, 97 (2017).
- Directly probing spin dynamics in a molecular magnet with femtosecond time-resolution, J. O. Johansson, J.-W. Kim, E. Allwright, D. Rogers, N. Robertson, J.-Y. Bigot: Chemical Science, 7, 7061 (2016).
- Probing Excited Electronic States and Ionisation Mechanisms of Fullerenes, J.O. Johansson and E.E.B. Campbell, Chem. Soc. Rev. 42, 5661 (2013).
- Angular-Resolved Photoelectron Spectroscopy of Superatom Orbitals of Fullerenes, J.O. Johansson, G.G. Henderson, F. Remacle and E.E.B. Campbell, Phys. Rev. Lett. 108, 173401 (2012).